/Engine/Source/Editor/UnrealEd/Public/Kismet2/ComponentEditorUtils.h
Given a template and a property, propagates a default value change to all instances (only if applicable)
template<typename T> static void PropagateDefaultValueChange ( class [USceneComponent](API\Runtime\Engine\Components\USceneComponent) * InSceneComponentTemplate, const class [FProperty](API\Runtime\CoreUObject\UObject\FProperty) * InProperty, const T & OldDefaultValue, const T & NewDefaultValue, [TSet](API\Runtime\Core\Containers\TSet)< class [USceneComponent](API\Runtime\Engine\Components\USceneComponent) * > & UpdatedInstances, int32 PropertyOffset )